Page:Philosophy and Fun of Algebra.djvu/55

 CHAPTER IX THE USE OF SEWING CARDS

you go for holidays perhaps your friends will ask you what is the use of sewing curves on cards. I should like you to know exactly what to say.

The use of the single sewing cards is to provide children in the kindergarten with the means of finding out the exact nature of the relation between one dimension and two.

There is another set of sewing cards which is made by laying two cards side by side on the table and pasting a tape over the crack between them. This tape forms a hinge. You can lay one card flat and stand the other edgeways upright, and lace patterns between them from one to the other.

The use of this part of the method is to provide girls in the higher forms with a means of learning the relation between two dimensions and three.

There is another set of models, the use of 51